@fudgey
I terrible sorry, of course read all older messages, too. But my english is bad, and i am not expert. Not understand everything correctly.
My a590is, always show play mode zebra incorrectly, with/without zooming, panning and changing pictures. Record picture->play mode->half press shutter button-> blinking wrong zebra
I am beginner for programing, compiling, debuging. Many sources sucessfully build, packaging in linux.
I see the chdk source tree. A720is with new chdk 0.9.0-657 zebra always ok.
vid_get_viewport_fb_d() addresses in A720is and A590IS same. I think it is wrong. I am no way to check, correct or no. For expert users, it is ok, or how i can help?